Edge-folding machine



July 29, 1930. R. REUTER I 8 EDGE FOLDING MACHINE Filed Julyv 2, 1928 2 ShQO tU-SIIQOL 2 25 moreover to be turned out perfectl l l closer to the turningup device and all the yP atentecl July 29, 1930 o 1 I STATES I ROBERT Insomn a: OF OFFENBAGH-ON-THE-MAIN, GERMANY, ssreuon; ro SCHUFAB- BIK HASSIA A.-G.,YOF OFFENBACE-ONEHE-MAIN,GERMANY; A CORBORA'IION EDGE-FOLDING MACHINE p Applicationfiled s 2, l9 28 Seri a1 No. 289,924, and in Germany January so, 1928.

. ,i In the. knownj-machinesj for folding over up device inappropriate folds. For thispurf the edges ofleather and similar materials, as pose the guide is bent somewhat towards the for shoe straps or the like,the strip of leather stretching hook. v v p H havingab'evellededgafor instancegis guided :It mg furthermore; necessary to bend the 5 against a turning up 'tooljvvhileat the same materialpres sing device'mo're' sharply than 55 time a hammer;' acting from above, turns hitherto towards the turning up device so the bent up edge Completely over and presses that the operator serving the machine'm'ay the same down, To the hammer a'socalled allow his fingers, holding the Work, to ap jguide is'attached having a sharpedge Which 'proach closer to the tools and thus execute eflectsthe folding of thematerial particularthe rotation of the Work necessary atsharp lyf at curves; The leather strip is "held sebends therein. Inorder toensure that the curely by a materiahpresser. and is fed by a ,operator shall be jevenfless hindered by the conveyor device. With SUiC-hh'ltClllHQS, hovvmaterial .presser from efiecting said rotation i 7 ever, "it is possiblei'only to fold over straight precisely at'su'ch points it appears preferable edgesor onlyslightlyoutvvardly curved edges 7 to dispose therear portionof the-material 65 of the" material Whereas ashar'ply rounded presser higher above the'operating plate of part, particularlyat the end ofashoe strap the machine and to allow only the 'forfw a'rd couldnot be folded i,atf an: Such sharply portion to come incontact witl tlthe plate or curvedpartsn haveyftherefore, had," as'previwiththework;

o ously,'to'befolded oyerby hand,'anexpensive Furthermore the support carrying-the in- 70 'andjtime consumingoperation. I cisi on cutter necessary for the folding'over v Th present invention relates tea machine of convex curves in the'work is constructed for thispurpo seenabling even sha ly curved W th t t e ar prevlous yprovidedthereon edges ofleather stri s to be folded eve in order that lt'fl-Ild the cutter maybe taken 75 and with uniform disposal of the "separate @0018 af anged Closer'togeth'er; The feed foot folds. 'In'thismannerthe Work is simplified 1S 9 made Q PODd iI'IgIY n arr'0 Wer.'--'j xt ly nd the hol h ei' t p a b It is posslble with thiseonstruction to fold v fold d over all aroundi 'the machine. This Over v rp ve hout" any difiic'ulty.

is achieved'b various Jmodifi cations f the On embodlment'of s c ia m c i is 1 11 -4 tools of thema'chine. Firstflof all the edge g bx y' 'r n't 'a co p ysetup by the turning up devicfe'is prevented g f L'W g V y 1 i from being turned ove b the h m f Fig; 1 1s aplan'vlew from above;

. any considerable length by the provision of F g- 2 i -a front elevation,

I a stretching h ok on the turning up tool. The g- 3 is a Side elevation d. B5

bentup edgeiof the.-'leather lies between id Figs. 4 and 5 yiews from above and from stretchinghook and'the turning 'up'device 01 1B i e respectlvelyofthe ur gfl p v(1B? and is held-by both so that only th p t f woe and thestretching hook mounted theretheedge directly'inffront thereof can be and Ofthe o khe cl'thereby.

#40 tturned'over by the hammer." Also'the h m- TllG'WOIk 1 to be folded over'i's' flattened 90 t r th d of th l ath f and l t tn th V1064 to which-a stretching hook 5issecured i so h p d t te d in th f or bevelledht' the edge to facilitateits'fold- 'ofan'arc around t. guide device mounted 111g. In Figs. land 5 the bevellededge is rotatably on'i ,eloseljupto the tnrning' up shown unfolded at 2 and folded at"3.';:' The device so that said hammer always tencoun- 'folding'tool consists of the turning ;up de- 'same dov'vneven whenzfoperating" onflia eonby means-of a screw 5*. The'ho'ok extends v siderable bend inthe'edge'of the strap. The over and beyond the front edge 6" of the guide device I is similarly placed closeup turn ng up device tosuch an extent that a against the turningfup device toenable it to. gap oorresponding' approx mately to the lay'the'mate'rial' emerging"from'theturning thickness of the edge-of IIlfllZGI'lLl to 'befolded also furnished with an extension 13 the end of which projects to a position close in front of the turning up device 4 in order that the r hammer shall still encounter the work-edge to be folded over even at sharp curves in said work; This extension .13 also embraces the folder 9. I V f The material pressing device 14 has a supporting arm 15 which is firstly disposed closer to the turning up device than hitherto and secondary is bent away upwardly as is clear in particular from Fig.2 in which said material presser is illustrated in the raised position. The disposal of the presser arm nearer to the turning up device and above the operating plate 16 of the machine enables the operator to bring his fingers closer to the folding tools than he was previously able to do and thus to hold and rotate the work properly when a sharply bentedge thereof is be ing folded over.

In order not to interfere with the rotation of the work when folding over a sharply bent or curved edge the surface 17 of the feed device 18 contacting with the work ismade substantially smaller than hitherto. Also the guide 19 determining the width of the edge to be folded over is brought closerto the turning up device. This is made possible by constructing theso-called cutter support 20, which was hitherto provided with an arch intended to assist the turning up device in the folding over of the edge, without said arch. It is also possible to make narrowerthan heretofore the incision cutter 21 which effects the incision of the work edge, whenaninwardly curved edge is to be folded over, with the aid of the sharp edge 22 of the cutter support.

The machine operates in the usual manner, the work being held by the work presser ltand fed forward on the plate '16 by the conveyor device 18; the work runs in a known manner over aroll 23 Which projects through a corresponding opening in said plate 16. Thebevelled edge 2 of the work lis set up by the" turning up device 4 and is held inthis positionby the stretching'hook 5, The'l'atter is primarily of importance when a sharp- 1y curved portion ofthe work,- say the front sharplycurved end of a shoe-strap,.is being folded over. Thehammer-7 is, moved'rapidly up and down inavertical direction and its extension 13, which moves close behind the turning up device, presses the leather edge downwardly. The folder 9 pivoted to said hammer is swung sharply towards the stretching hook by means of the rod 10 to fold the leather edge to the hammer. Said folder which is preferably bent towards the stretching hook somewhat forces the leather downwardly and lays it in the correct fold whilethe extension 13 of the hammer 7 presses securely on or strikesthe bent over leather. 7

Since the work presser is bent round more sharply and its support 15 isalso disposed higher than hitherto, the worker can allow his fingers to approach the tool more closely and thus efiect'the rotation of the work at a sharp bend which was'not possible until now.

i The machine is naturally operatedvat'a lower speed during folding over of a sharp bend or curve at, say, theend of a shoe strap or other work and the feed is also shortened at this point in order that the folds may follow one another smoothlyand uniformly. In certain, circumstances the stretching hook secured to the turning over device may also .be obviated particularly when the curvature at strap ends, for example, of the leather is not too sharp; said-stretching hook is, however, completely smooth and of the work. j I

WVhatIclaimisz. e I e [1. A machine for folding over the edge of a piece of fiat material, such as a leather strap, comprising in combination. a turningup device, a guide and a; hammer havingan extension embracing said: guide, which is mounted on saidhammer, and adapted to press the edge of the work downwardly in uniform folding over the close vicinity of said turning-up-device,

thereby ena'bling even sharply curvedwork to be folded over by the machine. 1

' 2. A machine as claimedinclaim -1,-and

a stretching hook mounted on the turning-- up device and adapted with the aid ofthe turning-up device to hold the bent up edge of the material. I 1' 3. A machine as claimed-inclaim 1, and a work presser, a supportingarm ofthe work bent upwardly substantially as andforthe purpose set forth. 7 r i 4. A machine as claimed in claim 1, and an unarched, cutter support constructed in. order not to hinder the work from being sharply rotated and to enable the guide to be brought nearer to the .tool.

L5. A'machine as, claimed in claim, 1,, a

stretching :hook and {a ,folder. .mounted .on

and whose extent of movementlmay be. va-

6. Almachinefforfolding. over the edge .of flat material comprising" in combination a of the greatest advantage for V .115 presser disposed close tothe tool and .1 the hammer, bent. towardthe stretching hook 1 a turning-up device, a

, as my invention,

turning-up device, a hammer having a hookthe device and shaped operating end close to a guide pivoted on the hammer and operating Within the hooked portion close to the guide.

7. A machine of fiat material, comprising in combination hammer having) a hooked end, a stretching hook adjusta 1y mounted on the turning-up device, an unarched cutter support and a narrow cutter adjacent said device and cooperating with said support. I

In testimony that I claim the foregoing I have signed my name.

' ROBERT REUTER.

for folding over the edge i 

